Hammer questions

I am building a 1340 of sorts and want to replace the hammer with the 1377 hammer. I know the stock 2240 sear won't engage the 1377 hammer but I will be making a custom sear to accommodate the hammer and the paintball grip I am going to use. Question is will the smaller hammer open the valve enough for any reasonable performance? I am going to use a 7 inch barrel and I'm going more for a look than performance. Accuracy is more important to me than power so a fairly low velocity is OK. A second question is how much power can I make up (if needed) with the hammer spring.

Another question is what material would you pick for the sear and how hard would you make the sear. I was thinking an old file might work. Would it be hardened all the way through or just the contact points. I never made a sear but have done a few folding knives and tools for work.

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